University of Tehran perss Journal of Crops Improvement 2008-8337 25 4 2023 12 22 Investigating the performance and physiological characteristics of wheat cultivars under the influence of nitrapyrin application in different tillage conditions Investigating the performance and physiological characteristics of wheat cultivars under the influence of nitrapyrin application in different tillage conditions 951 964 95363 10.22059/jci.2023.349512.2748 FA Ashkan Jalilian Ph.D. of crop ecology, Department of Agronomy and Plant Breeding, Faculty of Agricultural Science and Engineering, University of Tehran, Karaj, Iran Ghorban Khodabin Ph.D. of crop physiology, Department of Agronomy, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran 0000-0001-7236-9606 MOJDEH SADAT Khayat Moghadam Former Ph.D. Student, Department of Agronomy, Faculty of Agriculture, Shahrood University of Technology, Iran. 0000-0001-6701-9003 Ehsan Zandi Esfahan Associate Professor, Research Institute of Forests and Rangelands, Agricultural Research, Education, and Extension Organization (AREEO), Tehran, Iran. 0000-0002-7716-0331 Fatemeh Amini . Ph.D. candidate of agronomy, Department of Agronomy and Plant Breeding, Faculty of Agricultural Science, Islamic Azad University, Shahr-e-Qods Branch, Iran 0000-0003-1695-9518 Nima Shahbazi Ph.D. candidate of crop ecology, Department of Agronomy and Plant Breeding, Faculty of Agricultural Science and Engineering, University of Tehran, Karaj, Iran 0000-0002-2288-3380 Mohammad Zargaran Ph.D. candidate of crop ecology, Department of Agronomy and Plant Breeding, Faculty of Agricultural Science and Engineering, University of Tehran, Karaj, Iran 0000-0002-5900-1978 Journal Article 2022 10 05 The use of nitrification inhibitor nitrapyrin is vital for the long-term maintenance of urea fertilizer in the soil and preventing its leaching. Therefore, this study was carried out to investigate the yield and physiological characteristics of different wheat cultivars under different levels of fertilization and tillage systems. This study was performed as a split-split plot based on a randomized complete block design with three replicates in Karaj during two cropping seasons (2019-21). The experimental treatments included two tillage levels (no-tillage and conventional tillage) in the main plot and three fertilizer levels (urea, nitrapyrin + urea combination and control (main plot), and two cultivars (Rokshan and Pishgam) in the secondary plot. The results of the composite analysis showed that the highest yield of wheat grain was obtained in Rakhshan cultivar with 8331 kg/ha and the level of urea + nitrapyrin fertilizer was obtained in no-tillage, which was 6.15% superior to the level of urea. Also, in both tillage systems, the highest amount of leaf area index and nitrogen productivity index was obtained in the same treatment, so compared to the treatment of urea application, 6.1%, 2.7% in no-tillage and 0.8% and 1.3% in Cultivation was more common. In general, nitrapyrin improved wheat yield in both tillage levels. In addition to improving plant performance, the use of nitrapyrin can also be effective in reducing environmental hazards caused by the use of chemical fertilizers such as urea. The use of nitrification inhibitor nitrapyrin is vital for the long-term maintenance of urea fertilizer in the soil and preventing its leaching. Therefore, this study was carried out to investigate the yield and physiological characteristics of different wheat cultivars under different levels of fertilization and tillage systems. This study was performed as a split-split plot based on a randomized complete block design with three replicates in Karaj during two cropping seasons (2019-21). The experimental treatments included two tillage levels (no-tillage and conventional tillage) in the main plot and three fertilizer levels (urea, nitrapyrin + urea combination and control (main plot), and two cultivars (Rokshan and Pishgam) in the secondary plot. The results of the composite analysis showed that the highest yield of wheat grain was obtained in Rakhshan cultivar with 8331 kg/ha and the level of urea + nitrapyrin fertilizer was obtained in no-tillage, which was 6.15% superior to the level of urea. Also, in both tillage systems, the highest amount of leaf area index and nitrogen productivity index was obtained in the same treatment, so compared to the treatment of urea application, 6.1%, 2.7% in no-tillage and 0.8% and 1.3% in Cultivation was more common. In general, nitrapyrin improved wheat yield in both tillage levels. In addition to improving plant performance, the use of nitrapyrin can also be effective in reducing environmental hazards caused by the use of chemical fertilizers such as urea. https://jci.ut.ac.ir/article_95363_4c01db56212bfa9ea334c215774695af.pdf